High‐frequency variations in Earth rotation from Global Positioning System data

Rothacher, M.; Beutler, Gerhard; Weber, Robert L.; Hefty, J.

doi:10.1029/2000jb900393

Cited by 44 publications

(37 citation statements)

References 33 publications

(32 reference statements)

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“…GPS estimates of the prograde polar motion, 137 and 168 mas from Rothacher et al [2001] and Englich et al [2007], bracket an older VLBI estimate of 145 mas by Gipson [1996]. Those spherical harmonic solutions for O1 predicting polar motion similar in amplitude to the numerical tide models' predictions yield prograde components ∼40 mas, distinctly less than the observations.…”

Section: Comparison With Rotational Observationsmentioning

confidence: 88%

“…[49] For UT1, a wide range of earlier VLBI analyses found the O1 signal to be ∼21-25 ms (various researchers tabulated by Chao et al [1996] and Chao and Ray [1997]); more recent GPS analyses yield ∼23-27 ms [Rothacher et al, 2001;Englich et al, 2007]. In contrast to numerical tide models, especially those with altimetric sea level data assimilation, the spherical harmonic model predicts UT1 effects with a significantly smaller total (cf.…”

Section: Comparison With Rotational Observationsmentioning

confidence: 99%

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Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

Dickman¹

2010

J. Geophys. Res.

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[1] Suitably generalized, ocean tide models can be used to determine the oceans' response to atmospheric pressure forcing; but the huge range of spatial and temporal scales of that forcing limits the relevance of state-of-the-art tide modeling techniques, like data assimilation, for such determinations. With an interest in its effects on Earth's rotation, in 1998 I employed a generalized but non-assimilating spherical harmonic tide model to determine the oceanic response to pressure forcing, however restricting its application to time scales exceeding a few days. This article revisits that spherical harmonic model in an attempt to improve its rotational predictions of short-period tides. We find that increasing the resolution of the model ocean does not by itself affect the tidal solution much, but varying the model's frictional parameters can produce diurnal tides whose effects on Earth's polar motion are similar to those of a variety of other ocean tide models. Such an improved model will allow our calculations of the oceans' dynamic response to pressure forcing, and the effects of that response on Earth's rotation, to be extended down to diurnal time scales.Citation: Dickman, S. R. (2010), Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations,

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Section: Comparison With Rotational Observationsmentioning

confidence: 88%

Section: Comparison With Rotational Observationsmentioning

confidence: 99%

Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

Dickman¹

2010

J. Geophys. Res.

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“…Another peculiarity of the spectrum are sharp peaks at frequencies ±4/5Ω n , ±6/5Ω n at a level of 2-7σ above the noise level. No convincing explanation was found, but it is suspected that this signal in the estimates may be an artifact caused by errors in modeling by analogy with a detection of a very strong signal in estimates of the harmonic constituents of the perturbational Earth's rotation from GPS time series at frequencies that are multiple to the diurnal frequency: S 1 , S 2 , S 3 , S 4 , etc., reported by Rothacher et al (2001). It should be noted that no non-tidal signal at S 3 , S 4 frequencies is seen from analysis of VLBI group delays.…”

Section: Harmonic Components In the Earth's Rotationmentioning

confidence: 97%

The empirical Earth rotation model from VLBI observations

Petrov¹

2007

A&A

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Aims. An alternative to the traditional method for modeling the kinematics of the Earth's rotation is proposed. The purpose of developing the new approach is to provide a self-consistent and simple description of the Earth's rotation in a way that can be estimated directly from observations without using intermediate quantities.Methods. Instead of estimating the time series of pole coordinates, the UT1-TAI angles, their rates, and the daily offsets of nutation, the method for estimating coefficients of the expansion of a small perturbational rotation vector into basis functions is proposed. The resulting transformation from the terrestrial coordinate system to the celestial coordinate system is formulated as the product of the a priori matrix of a finite rotation and an empirical vector of a residual perturbational rotation. In the framework of this approach, the specific choice of the a priori matrix is irrelevant, provided the angles of the residual rotation are small enough to neglect their squares. The coefficients of the expansion into the B-spline and Fourier bases, together with estimates of other nuisance parameters, are evaluated directly from observations of time delay or time range in a single least square solution.Results. This approach was successfully implemented in a computer program for processing VLBI observations. The dataset from 1984 through 2006 was analyzed. The new procedure adequately represents the Earth's rotation, including slowly varying changes in UT1-TAI and polar motion, the forced nutations, the free core nutation, and the high frequency variations of polar motion and UT1.

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“…Until today a set of quasars, forming an external set of markers, have provided the only way of determining the rotational velocity and the variations of the orientation of the rotational axis of the Earth with sufficient accuracy. Today residuals of less than 10 ls for the measurement of LOD and 0.5 nrad (0.1 mas) for the pole position are routinely achieved by a network of VLBI radio telescopes and GPS observations (HAAS, 2006;ROTHACHER, et al 2001), by the services of the IAG (International Association of Geodesy). The operation of such a network requires expensive equipment and substantial maintenance effort.…”

Section: Introductionmentioning

confidence: 99%

The Large Ring Laser G for Continuous Earth Rotation Monitoring

Schreiber

Klügel

Velikoseltsev

et al. 2009

Pure appl. geophys.

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Ring Laser gyroscopes exploit the Sagnac effect and measure rotations absolute. They do not require an external reference frame and therefore provide an independent method to monitor Earth rotation. Large-scale versions of these gyroscopes promise to eventually provide a similar high resolution for the measurement of the variations in the Earth rotation rate as the established methods based on VLBI and GNSS. This would open the door to a continuous monitoring of LOD (Length of Day) and polar motion, which is not yet available today. Another advantage is the access to the sub-daily frequency regime of Earth rotation. The ring laser ''G'' (Grossring), located at the Geodetic Observatory Wettzell (Germany) is the most advanced realization of such a large gyroscope. This paper outlines the current sensor design and properties.

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High‐frequency variations in Earth rotation from Global Positioning System data

Cited by 44 publications

References 33 publications

Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

The empirical Earth rotation model from VLBI observations

The Large Ring Laser G for Continuous Earth Rotation Monitoring

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